Electric motor for shaving devices



1940- H. EICKEMEYER 2,212,858

ELECTRIC MOTOR FOR SHAVING DEVICES Filed Aug. 26, 1937 NVENTOR 1:

Patented Aug. 27, 1940 UNITED STATES PATENT OFFlCE Henry Eickemeyer, Jersey City, N. J., assignor, by mesne assignments, to American Safety Razor Corporation, Brooklyn, N. Y., a corpora tion of Virginia Application August 26,

7- Claims.

My present invention relates to electric motors and more particularly to devices of the general character indicated which are especially adapted for use in connection with electric shaving devices, and aims to devise a motor which is simple in construction, easy and economical to fabricate and assemble, and consisting of the fewest possible number of movin parts so as to minimize wear and tear and res ting repairs. In the accompanying specification, I shall describe and in the annexed drawing show an illustrative embodiment of the devices of the present invention. It is, however, to be clearly understood that I do not wish to be limited to the exact details herein shown and described for the purposes of illustration only, inasmuch as changes may be made therein without the exercise of the inventive faculties and within the scope of the claims hereto appended. In the accompanying drawing,

. Fig. 1 is a side elevational view of the aforesaid illustrative embodiment of the present invention, the cover of the casing adapted to house the same having been removed for the purposes of clarity.

Fig. 2 is a perspective view of the drive constituting part 'of the aforesaid illustrative mbodiment of the present invention.

Referring now more in detail to the aforesaid illustrative embodiment of the present invention and with particular reference to the drawing illustrating the same, numeral 5 generally designates a casing shaped to conveniently fit the user's hand, there being illustrated in the draw-:

ing merely one-half of said casing for purposes of clarity, the two halves being identical. Re-

movably afilxed to the casing by any preferred means is a shaving head 6, the latter being'no part of the present invention, and therefore, not being described in detail- While I prefer to utilize the head shown, described and claimed in my co-pending application, entitled fElectric shaver. head," Serial Number 142,591 an filed May 14, 1937, I do not wish to be limited the use thereof 'inasmuch as any type of head-which fs adapted to be operated by reciprocation may be used.

The casing is provided with a cavity 1 which is adapted to house the motor 8. r

The motor- 8 comprises the laminated pole pieces 9, the lower ends of which are connected by the conventional yoke about which is wound a coil l9. Riveted or otherwise aflixed to the'outer faces of the pole pieces 9 are Bakelite or other similar insulating sheets ii, there being shown in the drawing only the front sheet, but it being understood that the rear surfaces of the pole 1937, Serial No. 161,009

\ pieces 9 are provided with a similar sheet. Fixed in the sheets I l, at about the centers thereof, are registering bushings l'2 having journalled therein a rotor shaft l3 on which there is fixed, intermediate the pole pieces 9, a rotor l4 adapted as is wellknown to be rotated when energized by the magnetic flux flowing between the pole pieces 9.

The front sheet H is provided with posts I! and It to which are respectively secured arms I! and i8 provided with oil'set portions 19 and .29; The arms I! and I8 are provided on the inner surfaces thereof with insulating strips 2! and 22 held in place by inwardly bent lugs l1 and I8, formed integrally with the arms i1 and I8.

' The free ends of the oflset portions 19 and 20 v of the arms 11 and it are provided with facing contact points l9 and 20' which are normally maintained in contact with each other by means of leaf springs 23 and 24, the inner ends of which are secured to the arms I! and I8, and the outer ends of which are secured to posts 25 and 29. In order to limit the movement of the arms l1 and 18, toward each other when the contacts l9 ani'l 20' are held apart as will hereinafter more y be explained, I provide the sheet i I with a pin 21.

The post 25 is connected by a wire 28 to oneend of the coil [0, and the post .26 is connected 7 an insulating support3l fixed in the lower end of the casing 5. The other end of the coil II isv one end of which extends a straight arm 3'! extending through a slot 38 in theouter cutter 39 of the head 6 into-a slot 49 formed in the inner cutter oi the" head 9, the arrangement being such that reciprocation of the arm 31 results in reciprocation of the, inner cutter II to carry out a the cutting operation well known to those skilled in the art. v I

Also extending from the hub 36 of the rocker 35 in the direction opposite to that in which the by a wire 29 to an outlet prong 30 connected by v arm 31 extends, is an arcuate arm .42, the outer end of which is provided with contact-breaking wings 4 3 and .44, and the arm 42 is provided intermediate the wings 43 and 44 with a slot 02' adapted to 'receive a roller 45 eccentrically mounted upon the end of the rotor shaft 13. If desired, instead of using a roller, there may be substituted an ordinary pin.

This completes the description of the aforesaid illustrative embodiment of the present invention, and the operation thereof may be briefly summarized as follows:

The prongs 3t and 33 are adapted to engage a source of current either alternating or direct. Current entering the prong 33 enters the coil it through the wire 32. This current energizes the pole pieces 9 so as to rotate the rotor Hi. From the coil it the current passes by way of the wire 28 to the post 25 and from this point it travels through the spring 23 to the arm l1. From the 'arm I? the current passes by way of the offset portion it through the touching contact points l9 and 2t tothe oflset portion of the arm i8.

' From the arm it the current passes by way of the spring 25 to the post 26 and then through the wire 29 to the prong 38, completing the circult.

ning the rotor it by means of a conventional starting wheel, not shown herein.

As the rotor I rotates, the eccentrically mounted pin 65 engaged in the slot 2 of the rocker 85 causes the latter to be reciprocated on the stud 36, and this movement is imparted to the inner cutter til of the head 6 through the arm 31.

'rAs the rocker is reciprocated, the wings 63 and it alternately engage the insulating strips 21! and 22 carried by the arms H and I8 so as to rapidly make and break the circuit through the contact points l9" and 2B, the arrangement being such that the circuit is made and broken twice during the course of each revolution of the rotor it and the moments of the breaking occurring when the rotor is bridging the pole pieces 9.

Ihis completes the description of the operation of the aforesaid illustrative embodiment of the present invention. It will be noted from all of the foregoing that the devices of the present invention are simple in construction, easy and economical to fabricate and assemble, 'and in view of the use of very few moving parts, presents a motor in which there is minimum of wear and Of course, the motor is started by initially spinunitary rocker arm having an extension to trg late rotary to reciprocatory motion and another extension to complete and interrupt the circuit through said contact points.

2. In a motor having a pair of circuit-makingand-breaking contact points, a pin eccentrially associated with 'the rotor of said motor, and a pivotally mounted unitary rocker arm having an extension to translate the rotary to reciprocatory motion and another extension provided with a slot receptive of said pin, and operated by the rotation thereof to complete and interrupt the circuit through said contact points.

3. In a motor having a pair of circuit-making"- and-breaki'ng contact points, a pivotally mounted unitary rocker arm having an extension to trans-- late rotary to reciprocatory motion, and another extension having a winged portion engageable with said contacts to make and break the circuit therethrough.

4. In a motor having a pair of circuit-making and-breaking contactpoints, a pivotally mounted unitary rocker arm having an extension to translate rotary to reciprocatory motion, and another T-shaped extension having winged portions alternately engageable with said contacts to make and break the circuit therethrough.

5. In a motor having a pair of circuit-makingand-breaking contact points, a pin eccentrically associated with the rotor of-said motor, and a pivotally mounted unitary rocker arm having an plvotally mounted unitary rocker arm having an extension to translate the rotary to reciprocatory motion, and another T-shaped extension provided with a slot receptive of said pin, said second extension havingwinged portions alternately'engageable with said contacts to make and break the circuit therethrough.

7. In a motor operated tool operated by a rotaryelectric motor of the magnetic type, a make and break device for said motor, an oscillating "lever for transmitting motion from said motor to said tool, and means on said lever'for operating said make and break. 1-1 EICIZ ME! 

